Re: ACPI hotplug panic with current git head

Kenji Kaneshige
2009-01-19T01:15:36Z

Len Brown wrote:
>>> It looks like acpi_pci_get_bridge_handle() is returning NULL, so this is
>>> the fix that works for me.
>>>
>> I'm sorry for troubling you, and thank you for your patience.
>>
>> The patch seems to avoid the kernel panic, but I still don't know
>> why acpi_pci_get_bridge_handle() returns NULL here. I assumed
>> it should return non-NULL value here. So I'd like to investigate
>> it more.
>>
>
>
> Kenji,
> I'd like to push jejb's 1-liner upstream now.
> It make sense, and it prevents a boot panic regression
> that I'd rather not have others experience in rc2.
>

Yes, I agree. Thank you for doing this.

Thanks,
Kenji Kaneshige

> I agree that it is important to hotplug for you to figure out
> why this machine runs down that path in the first place,
> and I'm sure that James will continue to work with you
> on that after the 1-liner is in.
>
> thanks
> Len Brown, Intel Open Source Technology Center
>
>
>>> diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
>>> index f09b101..803d9dd 100644
>>> --- a/drivers/pci/hotplug/acpiphp_glue.c
>>> +++ b/drivers/pci/hotplug/acpiphp_glue.c
>>> @@ -266,6 +266,8 @@ static int detect_ejectable_slots(struct pci_bus *pbus)
>>> int found = acpi_pci_detect_ejectable(pbus);
>>> if (!found) {
>>> acpi_handle bridge_handle = acpi_pci_get_bridge_handle(pbus);
>>> + if (!bridge_handle)
>>> + return 0;
>>> acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
>>> is_pci_dock_device, (void *)&found, NULL);
>>> }
>
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